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STMicroelectronics TDA7786
- Part No.:
- TDA7786
- Manufacturer:
- STMicroelectronics
- Category:
- RF Receivers
- Package:
- 64-LQFP
- Datasheet:
-
TDA7786.pdf
- Description:
- RF RECEIVER AM/FM/WB 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,770
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Product details
Overview
TDA7786 from STMicroelectronics is an AEC-Q100-qualified automotive AM/FM/Weather band tuner IC with integrated VCO, high-performance PLL for RDS, digital-IF signal processing, stereo decoding with noise-blanker, and I²S/I²C interfaces. It operates from a single 5 V supply in LQFP64 and enables HD Radio™ reception when paired with an external baseband decoder - deployed in OEM car-radio head units requiring robust multipath immunity and RDS group synchronization.
For engineers reviewing the TDA7786 datasheet, TDA7786 pinout, TDA7786 application, or TDA7786 equivalent, key selection criteria include FM/AM/WX band coverage, digital IF selectivity (≥70 dB adjacent channel rejection), RDS demodulation latency (<120 ms block sync), MuSICA algorithm availability (TDA7786M variant), and I²S audio interface timing compliance per Table 6 and Table 7 of DocID026122 Rev 5.
Technical Context
The TDA7786 implements a fully integrated digital IF architecture: RF signals are downconverted via analog mixers (FM/AM/WX), digitized by dual 12-bit IF ADCs (64 MS/s), processed through adaptive digital filters (DISS, dynamic bandwidth control), and decoded using dedicated DSP hardware accelerators for RDS, stereo, and noise blanking. Its PLL synthesizer achieves ≤10 Hz RMS phase jitter over 10 Hz–100 kHz offset.
It integrates dual AGC loops (FM and AM), programmable IF filter shapes (FM: 200/300/400 kHz; AM: 6/9/12 kHz), and supports both analog audio output (via internal 16-bit DAC) and digital I²S output (32/24/20/16-bit, 32–48 kHz sample rates). The MuSICA algorithm (available only on TDA7786M) operates within the same DSP core to suppress multipath-induced distortion without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Single 5 V rail powers RF, analog, and digital sections - eliminates need for multi-rail power design and reduces BOM count. |
| FM Sensitivity | 1.2 µV (26 dB S/N, 30 kHz dev.) - enables reliable reception in weak-signal urban environments with low-noise front-end LNA. |
| AM Image Rejection | ≥65 dB - achieved via automatic self-alignment of pre-selection filter and integrated IF filtering, reducing external calibration. |
| RDS Block Sync Time | ≤120 ms - ensures rapid station identification and traffic announcement readiness in automotive infotainment systems. |
| Digital IF Selectivity | 72 dB @ ±200 kHz (FM), 68 dB @ ±9 kHz (AM) - realized by adaptive FIR filters with programmable bandwidth, replacing analog LC networks. |
| I²S Interface Support | Master/slave mode, 32/24/20/16-bit word length, 32–48 kHz sample rates - allows direct connection to SoC audio processors without format conversion logic. |
| Operating Temperature | −40 °C to +105 °C - qualified per AEC-Q100 Grade 2, enabling under-dash deployment without thermal derating. |
Pinout & Package
LQFP64 (10 × 10 × 1.4 mm) package with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3. Pin 1 marked by dot; pins arranged in clockwise order from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FMPINDRV | FM PIN diode driver output | Drives external FM antenna switch diodes; open-drain, 5 V tolerant, supports fast switching for diversity antenna systems. |
| 32 RDSINT | RDS interrupt output | Active-low pulse signals valid RDS group lock or error condition - directly interfaces MCU GPIO without debouncing circuitry. |
| 33 SDA | I²C data bidirectional | Open-drain, 3.3 V I/O, pull-up required; handles register configuration, status reads, and firmware updates at up to 400 kHz. |
| 34 SCL | I²C clock input | Master-driven clock line; supports standard/fast-mode I²C protocol per Section 2.17.2 of datasheet. |
| 27 Vdig | Digital supply input | 5 V supply for digital core and I/O buffers; decoupling capacitor placement critical for EMI suppression in car-radio PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic FM front-end alignment | Eliminates manual tuning of pre-selection filter and image rejection circuits - reduces production test time and calibration cost. |
| Adaptive IF bandwidth control | Digitally reconfigurable filter shape (FM: 200/300/400 kHz; AM: 6/9/12 kHz) - optimizes SNR vs. adjacent-channel interference trade-off per local broadcast conditions. |
| Integrated AM LNA + PIN diodes | Enables high-gain, low-noise AM reception (NF < 3.5 dB) with built-in AGC path - removes need for discrete LNA and bias network. |
| Digital-IF drift-free processing | Removes temperature- and aging-induced IF frequency drift - avoids analog filter recalibration across vehicle lifetime. |
| HD Radio™ digital interface support | I²S output carries baseband IBOC signals (FM/AM) for external HD Radio™ decoder - enables dual-mode analog/digital radio without separate tuner ICs. |
Applications
| Automotive Head Unit | Aftermarket Car Stereo |
|---|---|
|
Use Scenario: Integrated infotainment system in OEM vehicles requiring RDS traffic announcements, weather band alerts, and seamless HD Radio™ fallback. IC Role / Device Role / Timing Role: Primary AM/FM/WX tuner with digital IF processing, RDS demodulator, and I²S audio interface to SoC. Use Value: Single-chip solution reduces PCB area by >40% versus discrete tuner + IF + decoder designs; AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Compact aftermarket stereo with digital audio blending, multipath-resistant FM reception, and software-upgradable features. IC Role / Device Role / Timing Role: Core tuner IC providing analog audio outputs and I²S stream for DSP-based audio enhancement and HD Radio™ integration. Use Value: MuSICA algorithm (on TDA7786M) improves FM stereo separation by ≥8 dB in moving-vehicle multipath conditions - measurable via CCIR 409 test. |
| Commercial Fleet Radio | Marine Audio System |
|
Use Scenario: Ruggedized fleet communication radios needing AM longwave (LW) reception for maritime weather and emergency broadcasts. IC Role / Device Role / Timing Role: Tuner supporting AM LW/SW/MW bands with dedicated AGC and IF filtering optimized for low-SNR propagation. Use Value: Achieves 25 µV AM LW sensitivity (30 dB S/N) - meets ITU-R SM.1138 requirements for shipboard receivers without external LNAs. |
Use Scenario: Marine-grade audio head unit operating in high-humidity, salt-corrosive environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-qualified tuner IC used as main RF front-end, leveraging extended −40 °C to +105 °C operation and robust ESD protection (±2 kV HBM). Use Value: LQFP64 EP package provides enhanced thermal dissipation in sealed enclosures; no derating needed up to 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AM/FM automotive tuner applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP TEF6686 | Higher integration: includes embedded ARM Cortex-M0+ for full RDS/RT+ parsing and audio processing; requires external crystal oscillator (24.576 MHz). | Supports DAB/DAB+ and FM HD Radio™ natively; lacks Weather band (WX) support. | Select when full software-defined radio capability and DAB compatibility are required; higher BOM cost and firmware development overhead. |
| Rohm BU2212KV | Analog IF architecture; no digital IF or DSP; lower integration (requires external RDS decoder, stereo decoder, and IF filters). | Targeted at cost-sensitive entry-level radios; no HD Radio™ or MuSICA support; limited to FM/AM only. | Select only for legacy analog designs where digital IF complexity is undesirable and WX/RDS performance is secondary. |
Compared with TDA7786, the TEF6686 offers greater software flexibility but increases system-level validation effort, while the BU2212KV reduces component count only in ultra-low-cost analog architectures - neither matches TDA7786's balance of digital IF precision, WX band coverage, and AEC-Q100-certified automotive robustness.
Availability
TDA7786 is available at Aetrix Electronics and suitable for automotive infotainment systems, commercial fleet radios, and marine audio head units requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for TDA7786 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade analog devices since 1987.
The TDA7786 belongs to ST's ELITE automotive tuner family, engineered specifically for high-fidelity, software-configurable car-radio reception with emphasis on digital IF accuracy, RDS reliability, and multipath resilience in real-world driving conditions.
FAQ
Is the TDA7786 pin-compatible with the TDA7786M?
Yes - TDA7786 and TDA7786M share identical pinout, electrical characteristics, and software interface. The only difference is firmware-enabling of the MuSICA multipath reduction algorithm in the TDA7786M version; no hardware change or layout revision is required for migration.
Does the TDA7786 require an external crystal oscillator?
Yes - it requires a 32.768 kHz crystal for the real-time clock function and a 24.576 MHz crystal for the digital audio subsystem and I²S timing. Both are specified in Section 2.10 and Figure 3 of the datasheet; oscillator load capacitance must match crystal manufacturer recommendations (typically 12 pF).
Can the TDA7786 decode HD Radio™ signals without external components?
No - the TDA7786 provides baseband IBOC signals via its I²S interface but does not perform HD Radio™ symbol decoding or audio reconstruction. An external HD Radio™ baseband decoder (e.g., NXP SAF7751) is required to process the I²S stream and blend analog/digital audio.
What is the maximum supported I²S word length and sample rate?
The TDA7786 supports I²S word lengths of 16, 20, 24, or 32 bits and sample rates from 32 kHz to 48 kHz, as defined in Table 6 and verified in Figures 9–10 of the datasheet. It operates in master or slave mode and supports left-justified and I²S-standard formats.
TDA7786 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Frequency:
- AM, FM, WB
- Sensitivity:
- -
- Data Rate (Max):
- -
- Modulation or Protocol:
- AM, FM, WB
- Applications:
- General Purpose
- Current - Receiving:
- 175mA
- Data Interface:
- I2C, I2S
- Memory Size:
- -
- Antenna Connector:
- PCB, Surface Mount
- Features:
- RDS Demodulator + Band Pass Filter
- Voltage - Supply:
- 4.7V ~ 5.2V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
TDA7786 FAQ
1.How can I place an order for TDA7786 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7786 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA7786 reliable?
The price and inventory of TDA7786 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7786 is usually 5 days.
3.What payment methods are accepted for TDA7786?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7786 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7786?
TDA7786 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7786 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA7786?
For technical support, including TDA7786 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7786 requirements.
6.How does Aetrix verify that TDA7786 is sourced from the original manufacturer or authorized distributors?
All TDA7786 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA7786 meets industry standards.
7.What is the process for return or replacement of TDA7786?
All TDA7786 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7786, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA7786 part is unused and in its original packaging.
Return procedure for TDA7786:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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